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The de Blasio administration is guilting parents in ultra-liberal Park...

Department of Education staffers have been touring districts to field questions and sell the proposal, which aims to boost diversity.

The often-raucous, well-attended CEC meetings have usually been held in school auditoriums.

But Monday’s assembly was held in a small conference room with about five non-CEC parents on hand, and none posed a question to DOE representatives.

“That’s a pretty strong indication that nobody knew about this,” said a parent. “I personally know multiples of that number who would have been there had they known.”

District 15, which includes Park Slope and Sunset Park, is considered one of the city’s top academic communities and sends a high percentage of its students to the specialized high schools.

“All you have to know is that MS 51 is a top-10 feeder school,” said Stanley Ng, a former CEC 20 member and active opponent of the admissions changes. “It’s hard to believe that parents from that school would not show up.”

An initial CEC 15 agenda posted to Facebook and e-mailed out on Oct. 30 made no mention of the DOE presentation. A CEC source claimed the DOE had not yet confirmed its attendance at that point — and that the Friday update was sent out after it did so.

But the DOE said Tuesday that the meeting had been planned since August.

CEC president Camille Casaretti said she was not familiar with the exact dates or details of the agenda e-mails and declined to comment further. Another CEC source chalked up the late agenda to scheduling confusion.

After The Post’s inquiries, the CEC said it would host the presentation a second time in order to accommodate any additional interested parties.

Known as liberal-leaning, District 15 drew strong parental support earlier this year for a sweeping school-diversification plan for its middle schools.